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原文:
Seen from ice moon Tethys, rings and shadows would display fantastic views of the Saturnian system. Haven’t dropped in on Tethys lately? Then this gorgeous ringscape from the Cassini spacecraft will have to do for now. Caught in sunlight just below and left of picture center in 2005, Tethys itself is about 1,000 kilometers in diameter and orbits not quite five saturn-radii from the center of the gas giant planet. At that distance (around 300,000 kilometers) it is well outside Saturn’s main bright rings, but Tethys is still one of five major moons that find themselves within the boundaries of the faint and tenuous outer E ring. Discovered in the 1980s, two very small moons Telesto and Calypso are locked in stable locations along Tethys’ orbit. Telesto precedes and Calypso follows Tethys as the trio circles Saturn.
中文翻譯:
在冰月泰坦(Tethys)上所看到的環和陰影，展現出土星系的壯觀景色。如果你最近沒有去過泰坦，那麼這幅來自卡西尼(Cassini)太空船的美麗環景將會是個不錯的替代選擇。這張照片拍攝於2005年，可以看到泰坦在照片左下方被陽光照亮。泰坦的直徑約為1,000公里，距離這個氣體巨星的中心約五個土星半徑（約300,000公里）運行。這個距離使它遠離了土星的主要明亮環，但泰坦仍然是五大主要衛星之一，位於微弱且稀薄的外E環之內。泰坦的軌道上還有兩個於1980年代被發現的小衛星——特列斯托(Telesto)和卡律普索(Calypso)，牠們分別在泰坦的前後穩定地運行，與泰坦一起圍繞著土星運轉。
#泰坦 #土星 #卡西尼 #環景 #太空探索 #宇宙奇觀 #月球 #衛星 #E環 #太空科學
來源:NASA每日圖片
